When I bought my LG TV a few years back it did the same. The ads were mostly for apps you can download on the LG app store (so no yoghurts or anything). But they were still annoying enough for me to look into the DNS queries the TV does and block some of them. In case it's useful for some of you, here's what I found out and ended up blocking:

  - vcfd1.giraffic.net, vcfd2.giraffic.net: adaptive Video acceleration (seems to be used for internet TV)
  - GB.lgtvsdp.com, ngfts.lge.com: don't know what this does.
  - GB.ibs.lgappstv.com: needed to download apps and updates
  - snu.lge.com: used to check for software updates?
  - lgtvonline.lge.com: likely for the TV recommendations feature that remembers what you watch and gives you recommendations based on it
  - GB.info.lgsmartad.com: ads
  - yahoo.com: no idea why the TV needs to talk to yahoo. Blocked.
  - facebook.com: why!? Blocked.